#include <stdio.h>


//熊贤豪
int main()
{
    int a,count = 0;
    for(a = 5;a <=100;a+=5)
    {
        count++;
        if(!(a%25))
        {
            count++;
        }
    }
    printf("The number of 0 in the end of 100! is:%d\n",count);
    return 0;
}